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The cabinet MUST have an uninterrupted or unbroken ground
according to NEC ANSI/NFPA 70-1999 and Canadian Elec-
trical Code CSA C22.1 or local codes to minimize personal
injury if an electrical fault should occur. This may consist of
electrical wire or conduit approved for electrical ground when
installed in accordance with existing electrical codes. Do not
use gas piping as an electrical ground. Failure to follow this
warning could result in electrical shock, fire, or death.
24-V WIRING
Make field 24-v connections at the 24-v terminal strip. (See Fig.
14.) Connect terminal Y as shown in Fig. 15 for proper operation
in cooling mode. Use AWG No. 18 color-coded wire only.
The 24-v circuit contains an automotive-type, 3-amp fuse located
on the main control. Any direct shorts during installation, service,
or maintenance could cause this fuse to blow. If fuse replacement
is required, use ONLY a 3-amp fuse of identical size.
ACCESSORIES
1. Electronic Air Cleaner (EAC)
Table 6—Electrical Data
UNIT SIZE
VOLTS—
HERTZ—
PHASE
OPERATING VOLTAGE RANGE
MAXIMUM
UNIT AMPS
MINIMUM
WIRE GAGE
MAXIMUM WIRE
LENGTH FT‡
MAXIMUM
FUSE OR CKT BKR
AMPS†
Maximum* Minimum*
050-08 115—60—1 127 104 6.6 14 42 15
050-12 115—60—1 127 104 8.1 14 34 15
070-08 115—60—1 127 104 6.7 14 42 15
070-12 115—60—1 127 104 8.4 14 33 15
096-12 115—60—1 127 104 9.2 14 30 15
096-16 115—60—1 127 104 10.2 14 28 15
115-16 115—60—1 127 104 10.1 14 28 15
115-20 115—60—1 127 104 13.3 12 33 20
115-22 115—60—1 127 104 15.2 12 29 20
135-20 115—60—1 127 104 14.3 12 31 20
* Permissible limits of the voltage range at which the unit will operate satisfactorily.
† Time-delay type is recommended.
‡ Length shown is as measured 1 way along wire path between unit and service panel for maximum 2 percent voltage drop.
Fig. 12—Downflow Filter Arrangement
A88486
RETURN-AIR
PLENUM
AIRFLOW
ACCESS DOOR
INSTALLATION
POSITION
OF FILTERS
Table 5—Maximum Capacity of Gas Pipe *
NOMINAL IRON
PIPE SIZE
(IN.)
INTERNAL
DIAMETER
(IN.)
LENGTH OF PIPE (FT)
10 20 30 40 50
1/2 0.622 175 120 97 82 73
3/4 0.824 360 250 200 170 151
1 1.049 680 465 375 320 285
1-1/4 1.380 1400 950 770 660 580
1-1/2 1.610 2100 1460 1180 990 900
* Cubic ft of gas per hr for gas pressures of 0.5 psig (14-in. wc) or less, and a
pressure drop of 0.5-in. wc (based on a 0.60 specific gravity gas). Ref: Table
10-2 NFPA 54/ANSI Z223.1-1999.
Fig. 13—Typical Gas Pipe Arrangement
A89414
GAS
SUPPLY
MANUAL
SHUTOFF
VALVE
(REQUIRED)
SEDIMENT
TRAP
UNION
11